The conductivity of different polypyrrole salt films has been varied by treatment with NaOH and H//2SO//4. With NaOH, conductivities smaller than that of the initial sample can be obtained whereas an H//2SO//4 treatment leaves the conductivity nearly unchanged. Both procedures result in an increase in the long-term stability of the conductivity at least at 80 degree C and 140 degree C. Using elemental analysis and energy dispersive X-ray spectroscopy it was shown that the chemical treatments cause ion exchange processes which are almost completely reversible. The properties of the polypyrrole salt film such as conductivity, weight, thickness, and oxygen permeability are closely related to the counterions.
